Exercise bar



FIG. 1 is a right perspective view of an exercise bar illustrating or showing the new design;

FIG. 2 is a front view thereof;

FIG. 3 is a rear view thereof;

FIG. 4 is a right view thereof;

FIG. 5 is a left view thereof;

FIG. 6 is a top view thereof; and,

FIG. 7 is a bottom view thereof.

The broken lines depicts portions of the article that form no part of the claimed design. 

CLAIM The ornamental design for an exercise bar, as shown and described. 